Unless otherwise stated, the following definitions shall apply to this chapter:
"Accelerated erosion"means the rate and amount of erosion caused by development activities that exceeds the natural processes by which the surface of the land is worn away. Erosion includes the movement or loss of soil by the action of water, wind or chemicals.
"Basin plan"means the water quality control plan for the Santa Ana Basin adopted by the Santa Ana Regional Water Quality Control Board in March 1994 and any subsequent updates and amendments.
"Best management practices (BMPs)"means schedules of activities, pollution treatment practices or devices, prohibitions of practices, general good housekeeping practices, pollution prevention and educational practices, operation and maintenance procedures and other management practices or devices to prevent or reduce to the maximum extent practicable (MEP) the discharge of pollutants directly or indirectly to stormwater, receiving waters or the stormwater drainage system. BMPs may be structural or non-structural, and include, but are not limited to, site design, source control, treatment control, and natural design methods. BMPs may include any type of pollution prevention and control measure that can help to achieve compliance with this chapter.
"Co-permittee"means the County of Orange, the Orange County Flood Control District, and/or any one of the other municipalities within the County of Orange, including the City, which are responsible for compliance with the terms of the NPDES permit.
"DAMP"means the Orange County Drainage Area Management Plan, including all appendices, as the same may be amended from time to time.
"Development project guidance"means DAMP Chapter VII and the Appendix thereto, entitled New Development/Significant Redevelopment, as the same may be amended from time to time.
"Discharge"means any release, spill, leak, pump, flow, escape, leaching (including subsurface migration or deposition to groundwater), dumping or disposal of any liquid, semi-solid or solid substance.
"Hearing officer"means the Public Works Director or designee, who shall preside at the administrative hearings authorized by this chapter and issue final decisions on the matters raised therein.
"Illicit connection"means any man-made physical connection to the stormwater drainage system which has not been authorized by the agency with jurisdiction over the system at the location at which the physical connection is made, or any such authorized connection which conveys prohibited discharges or any pollutant to the stormwater drainage system.
"Impaired water body"means a water body that is listed by the California State Water Resources Control Board as impaired by a particular pollutant or pollutants, pursuant to Section 303(d) of the Clean Water Act.
"Impervious surface area"means the ground area covered or sheltered by an impervious surface, measured in plan view (i.e., as if directly above). For example, the impervious surface area for a pitched roof is equal to the ground area it shelters, rather than the surface area of the roof itself.
"Impervious surfaces" or "covers"means a constructed or modified surface that cannot effectively infiltrate rainfall. The term includes, but is not limited to, building rooftops, pavement, sidewalks and driveways.
"Inspector"means authorized City inspectors who are assigned to investigate compliance with, detect violations of and/or take actions pursuant to this chapter.
"LIP"means the City Local Implementation Plan, including all appendices, together with any amendments or revisions, which is the document detailing the City's implementation of the DAMP.
"Maximum extent practicable"means the acceptability standard for best management practices (BMPs) established by Congress in Clean Water Act Section 402(p)(3)(B)(iii) that dischargers of stormwater must meet. Maximum extent practicable means using the most effective set of BMPs that can be implemented and still remain practicable. A BMP is effective if it prevents, reduces or removes pollutants that would otherwise be present in the runoff due to human activity. A BMP is practicable if it complies with stormwater and other regulations; is compatible with the area's land use, character, facilities and activities; is technically feasible (considering area soil, geography, water resources, and other resources available); is economically feasible; and provides benefits that are reasonable in relation to costs. Maximum extent practicable generally emphasizes pollution prevention and source control BMPs (as the first line of defense) in combination with treatment methods serving as a backup (additional line of defense).
"New development"means all public and private residential (whether single-family, multi-unit or planned unit development), industrial, commercial, retail, and other nonresidential construction projects, or grading for future construction, for which either a discretionary land use approval, grading permit, building permit or nonresidential plumbing permit is required.
"Non-prohibited discharge"means those discharges not prohibited by this chapter, and include only the following: (1) non-stormwater discharges authorized by a separate NPDES permit (other than the NPDES permit for discharges from the municipal stormwater drainage system) provided compliance with all permit conditions is maintained; (2) discharges from fire fighting activities; and (3) the following non-stormwater discharges pursuant to 40 CFR
122.26(d)(2)(iv)(B)(1) and listed in the NPDES permit, unless any of the following are identified as a significant source of pollutants to waters of the United States:
1. Discharges composed entirely of stormwater;
2. Potable water line flushing and other potable water sources;
3. Air conditioning condensate;
4. Landscape irrigation, lawn garden watering and other irrigation sources;
5. Passive foundation drains;
7. Water from crawl space pumps;
8. Dechlorinated swimming pool discharges;
9. Non-commercial vehicle washing;
11. Rising groundwaters and natural springs;
12. Groundwater infiltration as defined in 40 CFR
35.2005(20) and uncontaminated pumped groundwater;
13. Flows from riparian habitats and wetlands;
14. Emergency fire fighting flows (i.e. flows necessary for the protection of life and property);
15. Waters not otherwise containing wastes as defined in California Water Code Section
13050(d); and
16. Other types of discharges identified and recommended by the permittees and approved by the Regional Board.
"Nonresidential plumbing permit"means a plumbing permit authorizing the construction and/or installation of facilities for the conveyance of liquids other than stormwater, potable water, reclaimed water or domestic sewage.
"Non-stormwater"means all discharges to and from a stormwater drainage system that do not originate from precipitation events (i.e. all discharges from a stormwater drainage system other than stormwater).
"Person"means any natural person as well as any corporation, partnership, government entity or subdivision, trust, estate, cooperative association, joint venture, business entity, or other similar entity, or the agent, employee or representative.
"Pollutant"means any agent introduced to stormwater or non-stormwater that may cause or contribute to the degradation of receiving water quality such that public health, the environment, or beneficial uses of receiving waters may be affected. The term may include, but is not limited to:
1. Artificial materials (such as floatable plastics, wood products or metal shavings);
2. Household waste (such as trash, paper, and plastics; cleaning chemicals; yard wastes; animal fecal materials; used oil and fluids from vehicles, lawn mowers and other common household equipment);
3. Metals and non-metals, including compounds of metals and non-metals, (such as cadmium, lead, zinc, copper, silver, nickel, chromium, cyanide, phosphorus and arsenic), with characteristics which cause an adverse effect on living organisms;
4. Petroleum and related hydrocarbons (such as fuels, lubricants, surfactants, waste oils, solvents, coolants and grease);
5. Animal wastes (such as discharge from confinement facilities, kennels, pens and recreational facilities, including, stables, show facilities, or polo fields);
6. Substances having a pH less than 6.5 or greater than 8.6, or unusual coloration, turbidity or odor;
7. Waste materials and wastewater generated on construction sites and by construction activities (such as painting and staining; use of sealants and glues; use of lime; use of wood preservatives and solvents; disturbance of asbestos fibers, paint flakes or stucco fragments; application of oils, lubricants, hydraulic, radiator or battery fluids; construction equipment washing; concrete pouring and cleanup; use of concrete detergents; steam cleaning or sand blasting; use of chemical degreasing or diluting agents; and use of super chlorinated water for potable water line flushing);
8. Materials causing an increase in biochemical oxygen demand, chemical oxygen demand or total organic carbon;
9. Materials which contain base/neutral or acid extractable organic compounds;
10. Those pollutants defined in Section 1362(6) of the Federal Clean Water Act; and
11. Any other constituent or material, including but not limited to pesticides, herbicides, fertilizers, fecal coliform, fecal streptococcus or enterococcus, or eroded soils, sediment and particulate materials, in quantities that will interfere with or adversely affect the beneficial uses of the receiving waters, flora or fauna of the State.
"Priority development project"means any of the following development categories as defined in the NPDES permit:
1. All significant redevelopment as defined herein;
2. New developments that create 10,000 square feet or more of impervious surface (collectively over the entire project site) including commercial, industrial, residential housing subdivisions (i.e., detached single-family homes, multi-family attached subdivisions (townhomes), apartments, condominiums, etc.), mixed-use and public projects;
3. Automotive repair shops (with SIC codes 5013, 5014, 5541, 7532-7534, 7536-7539);
4. Restaurants where the land area of development is 5,000 square feet or more;
5. Hillside developments of 5,000 square feet or more, which are located on areas with known erosive soil conditions or where the natural slope is 25% or more;
6. Developments of 2,500 square feet of impervious surface or more adjacent to (within 200 feet) or discharging directly into environmentally sensitive areas such as areas designated in the Ocean Plan as areas of special biological significance or water bodies listed on the CWA Section 303(d) list of impaired waters;
7. Parking lots of 5,000 square feet or more of impervious surface exposed to stormwater. Parking lot is defined as a land area or facility for the temporary storage of motor vehicles;
8. Streets, roads, highways and freeways of 5,000 square feet or more of paved surface. This includes any paved surface used for the transportation of automobiles, trucks, motorcycles and other vehicles and excludes routine maintenance activities when the footprint is not changed;
9. Retail gasoline outlets of 5,000 or more square feet with projected average daily traffic of 100 or more vehicles per day;
10. Emergency and public safety projects in any of the above-listed categories may be excluded if the delay caused due to the requirement for a WQMP compromises public safety, public health and/or environmental protection.
"Prohibited discharge"means any discharge to or from the stormwater drainage system or to a receiving water that is not composed entirely of stormwater. This includes, but is not limited to, discharges of non-stormwater that are not defined as non-prohibited discharges, any discharge from an illicit connection, or any discharge which causes or contributes to the exceedance of basin plan receiving water quality objectives. Discharges pursuant to a separate NPDES permit (other than the NPDES permit for discharges from the municipal stormwater drainage system) are prohibited unless compliance with all applicable permit conditions is maintained.
"Receiving water"means all waters as defined in the NPDES permit, including, but not limited to, natural streams, creeks, rivers, lakes, bays, the Pacific Ocean and groundwater.
"Significant redevelopment"means the addition or replacement of 5,000 square feet or more of impervious surface on a developed site. Redevelopment does not include routine maintenance activities that are conducted to maintain original line and grade, hydraulic capacity, original purpose of the facility, or emergency redevelopment activity required to protect public health and safety. Where redevelopment results in the addition or replacement of less than 50% of the impervious surfaces of a previously existing developed site, and the existing development was not subject to WQMP requirements, the numeric sizing criteria applies only to the addition or replacement, and not to the entire developed site. Where redevelopment results in the addition of 50% or more of the impervious surfaces of a previously existing developed site, the numeric sizing criteria applies to the entire development.
"State general permit"means the State General Industrial Stormwater Permit, the State General Construction Permit or any other state general permit that has been or will be adopted and the terms and requirements of' any such permit. In the event the EPA revokes the in-lieu permitting authority of the State Water Resources Control Board, then the term state general permit shall also refer to any EPA administered stormwater control program for industrial and construction activities.
"Stormwater"means surface runoff and drainage associated with storm events and snow melt, and is that portion of precipitation that flows across a surface to the stormwater drainage system or receiving waters. Examples include, but are not limited to: the water that flows off a building's roof when it rains (runoff from an impervious surface); the water that flows from a vegetated surface when rainfall is in excess of the rate at which it can infiltrate into the soil (runoff from a pervious surface); and the water that flows into streams when snow on the ground begins to melt.
"Stormwater drainage system"means street gutter, channel, storm drain, constructed drain, lined diversion structure, wash area, inlet, outlet or other facility, which is a part of or tributary to the County-wide stormwater runoff system and owned, operated, maintained or controlled by the County of Orange, the Orange County Flood Control District or any co-permittee, and used for the purpose of collecting, storing, transporting, or disposing of stormwater.
"Urban runoff"means all flows in the stormwater drainage system and consist of stormwater and non-stormwater flows.
"Water quality management plan (WQMP)"means a water quality plan that is designed to minimize pollutant discharges during operation activities. Another synonymous term for such a water quality plan is Standard Urban Storm Water Mitigation Plan (SUSMP).
(Ord. 18-04; Ord. 6-10, 2010)